CS201057B1 - Method of processing residues of ruthenium and titanium oxides - Google Patents

Description

LOUČKA TOKÁŠ ing. CSo. »ÚSTÍ NAD LABEU

The present invention relates to a process for the treatment of ruthenium and titanium oxide residues after their removal from the surface of inactivated electrodes.

In recent years, great attention has been paid to metal anodes suitable for the electrolysis of alkaline halides, especially titanium-based anodes, which are covered with a thin layer of ruthenium and titanium oxides. Due to the relatively high cost of titanium and high ruthenium, it is advisable to ensure the reuse of the titanium skeleton and ruthenium residues from the active layer after the metal anode has lost its activity, i.e. the ability to work with optimal conditions in the electrolyser. The re-use of the titanium backbone is usually done by removing the remnants of the old active layer, for example with hydrochloric acid and reactivating, i.e. by applying new layers of mixed ruthenium and titanium oxides. However, there remains a problem of utilizing or treating the remnants of the active layer containing primarily ruthenium and titanium oxides.

The problem of treating residues of the ruthenium and titanium oxide layer removed from the surface of activated titanium anodes is solved by the present invention which consists in annealing these residues at a temperature of 600 to 1300 ° C with graphite for 15 minutes to 10 hours.

201 057 * · Χ · * 7

The present process makes it possible to selectively reprocess deoactivated ruthonium oxides and titanium oxides to compound compounds which can be used for re-activation.

The reduction of residues of the active graphite layer is carried out at such a temperature that only a complete reduction of the ruthonium oxides takes place, with the titanium oxides being reduced or only partially reduced. this allows further processing to the ruthonla chlorides themselves, without the need for costly separations of ruthenls, graphite and titanium oxide. By means of a suitable treatment, reduced mixtures are understood to be, for example, dissolved in a hypochlorite solution in which α dissolves only ruthonium, while graphite and titanium oxides remain in the insoluble foxrite. The resulting ruthenium can be further processed, for example, with ethanol gas to give ruthenium oxide, and by rupture and absorption in the acid solution, the salt forms of ruthonium can be directly used for novel actlvaol titanium scaffolds.

Example 1

The mixture of ruthonium oxides and titanium oxides, Ru < RTI ID = 0.0 > Ti < 1 > By rontgon-fraction analysis it was brightened, with at least 95% Ru reduced to metal. Metallic titanium was not found.

Example 2

The mixture of ruthonium oxides and titanium oxides, the weight ratio Ru ' Ti < 1 > Finished graphite was added in twice the mass excess. Rontgon-fraction analysis revealed neither the presence of ruthenla oxides nor titanium metal.

Example 3

The mixture of ruthonium oxides and titanium oxides, Ru 1 Ti 3 and 2 mass ratio, was annealed at 800 ° C for 4 hours with air. Finely ground graphite was added in twice the excess. No ruthonla oxide or titanium metal was found by nobyl analysis. The resulting mixture was treated by dissolving it in a hypochlorite solution, gaseous with chlorine gas to ruthenium oxide, and exaggerating and absorbing the hydrochloric acid solution to the ruthonium halide solution.

P ft E D M S T OF THE INVENTION

Claims (1)

P ft E D M S T OF THE INVENTION A process for the treatment of ruthenium oxide and titanium oxide residues from the surface of the active titanium anodes, characterized by annealing at 600 to 1400 with graphite for 15 minutes to 10 hours.